Add cp flush during shutdown in index btree

[shosseinimotlagh]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (bd80010) 56.14% compared to head (7c68d2b) 69.17%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #194       +/-   ##
===========================================
+ Coverage   56.14%   69.17%   +13.02%     
===========================================
  Files         108       93       -15     
  Lines        9676     7550     -2126     
  Branches     1199      966      -233     
===========================================
- Hits         5433     5223      -210     
+ Misses       3768     1866     -1902     
+ Partials      475      461       -14     

Files	Coverage Δ
src/include/homestore/index/index_internal.hpp	66.66% <ø> (+66.66%)	⬆️
src/include/homestore/index/index_table.hpp	90.65% <100.00%> (ø)
src/include/homestore/index_service.hpp	50.00% <ø> (+50.00%)	⬆️
src/lib/homestore.cpp	86.74% <100.00%> (+13.45%)	⬆️
src/lib/index/index_service.cpp	73.46% <46.15%> (+73.46%)	⬆️

... and 66 files with indirect coverage changes

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